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v3.8.0.1

Subsequent Event - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2018 | Apr. 17, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
$900.0 Million Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Total leverage covenant ratio |  |  |  | 5.00% |
$900.0 Million Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  | $ 900,000,000 | $ 900,000,000
Debt maturity period |  |  |  | Jul. 31, 2020 |
Subsequent Event | Non-Recourse Senior Secured Notes | Private Placement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Aggregate principal amount | $ 159,500,000 |  |  |  |
Stated interest rate | 4.43% |  |  |  |
Scheduled maturity term | 20 years |  |  |  |
Expected project completion period | first quarter of 2020 |  |  |  |
Notes issuance costs | $ 3,500,000 |  |  |  |
Subsequent Event | New Credit Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Line of credit facility maximum borrowing capacity |  | $ 1,000,000,000 |  |  |
Debt maturity period |  | Apr. 30, 2023 |  |  |
Total leverage covenant ratio |  | 5.50% |  |  |
Line of credit facility, increases in the revolving commitments or incremental term loans |  | $ 350,000,000 |  |  |
Subsequent Event | New Credit Agreement | Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Line of credit facility maximum borrowing capacity |  | 800,000,000 |  |  |
Subsequent Event | New Credit Agreement | Term Loan |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Loan amount |  | $ 200,000,000 |  |  |
Scenario Forecast | New Credit Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Capitalized loan costs |  |  | $ 2,100,000 |  |
Charges to write-off existing loan costs and other costs |  |  | $ 1,000,000 |  |

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- Definition Charges to write-off existing loan costs and other costs. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow for loan origination associated cost which is usually collected through escrow. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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